﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSharp04
{
    class Program
    {
        static void Main(string[] args)
        {
           
            Rectangle recta = new Rectangle(3,4);
            Rectangle rectb = new Rectangle();
            Console.WriteLine("rect a:{0}", recta.area());
            Console.WriteLine("rect b:{0}", rectb.area());
        
        }
    }
}
